XNUMX. Features of plunger stop valve:
The plunger stop valve has the advantages of simple and scientific structure, safe and reliable, and particularly easy and flexible opening and closing, and labor-saving operation. Compared with the plunger valve, the opening and closing is light and fast.Unique sealing performance, no leakage, the piston has a double-effect function consisting of a metal and non-metal multilayer sealing structure.The integrated valve seat (cylinder liner) has a radially tapered sealing surface with high height, large contact area and good performance.The selection of materials for the piston ring according to different applicable media can comprehensively improve its scope of use, such as high temperature resistance, abrasion resistance, corrosion resistance, and strong resilience performance. After long-term use, the adjustable pressure of the piston ring will increase if it is worn and maintained. Original state.Plunger stop valve repair and replacement of piston ring technology is simple and convenient, the valve body does not need to be detached from the pipeline, and the valve cover assembly can be replaced after the steam is stopped.
XNUMX. Structure performance and principle of plunger stop valve:
The plunger stop valve is composed of valve body, valve cover, gland, valve stem, valve plug, valve plug cover, piston ring, integrated cylinder liner (valve seat) rising rod nut, plane bearing, hand wheel, bevel gear and other components. As the wheel rotates, the rising rod drives the piston to reciprocate up and down between the inside and outside of the tapered cylinder liner to complete its closing and opening.
The cylinder liner structure of the plunger stop valve is tapered inside the cylinder liner (valve seat) cone and is welded with stainless alloy steel or cemented carbide according to the applicable medium. The hardness of the surfacing layer can reach HRC40, and it is made by boring and grinding. .
The sealing structure of the valve plug and the piston ring is composed of metal and non-metal multi-layer sealing. When a piston ring has been worn out during a long period of use and the pressure has been adjusted to zero, the pressure adjustment has failed, so the second metal is cut off Cone-shaped piston plays a role of sealing at the same time, so the service life of the plunger stop valve is several times longer than that of ordinary valves. Therefore, it does not need special maintenance and remains leak-proof during use, which can achieve better opening and closing of leak-free pipelines. The choice of device has obvious applications for saving energy, reducing labor and environmental pollution.